Hammer head



FIG. 1 is a top plan view of a hammer head showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a hammer head, as shown and described. 